What does the Alpha E43 fault code mean?

Your boiler is struggling to keep its flame lit and has tried to restart several times without success, causing it to lock out for safety.

How much does it cost to fix Alpha error code E43?

Typical repair cost for the Alpha E43 fault is £100-£350 including labour.

Check that your gas emergency control valve is in the 'on' position

Loss of flame signal (more than 6 times)

This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

Lockout fault with a reset-needed pattern.

Older boilers — thermocouple, draught, gas supply.

7 signs repair isn't worth it anymore.